.list-index {
    color: #057bf7;
    list-style: none;
    margin: 0;
    padding: 0;
    position:absolute;
    font-size: 11px;
    font-weight: bold;
    position:absolute;
    z-index:199;
    top:0%;
    height: 100%;
    right: 0;
    background: #fff;
    width: 15px;
    text-align: center;
    display: -webkit-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    -webkit-justify-content: center;
    justify-content: center;
    -webkit-box-orient: vertical;
    -moz-box-orient: vertical;
    -ms-flex-direction: column;
    -webkit-flex-direction: column;
    flex-direction: column;
}
.list-index li{
    position: relative;
    z-index: 10;
}
.list-index li:before {
    content: '';
    position: absolute;
    right: 100%;
    width: 10px;
    height: 100%;
    top: 0;
}
html[dir="rtl"] .list-index {
    right: auto;
    left: 0;
}
html[dir="rtl"] .list-index li:before {
    right: auto;
    left: 100%;
}
